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Guanfacine for the Treatment of Spatial Neglect and Impaired Vigilance

Information source: Imperial College London
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Stroke; Hemispatial Neglect

Intervention: Guanfacine (Drug); Placebo (Drug)

Phase: Phase 2

Status: Completed

Sponsored by: Imperial College London

Official(s) and/or principal investigator(s):
Paresh A Malhotra, PhD MRCP, Principal Investigator, Affiliation: Imperial College London
Masud Husain, DPhil FRCP, Principal Investigator, Affiliation: University College, London

Summary

To find out if spatial neglect following stroke and brain injury can be reduced using guanfacine, a drug that was shown to improve neglect in two stroke patients in a previous pilot study (Malhotra et al, 2006). In this trial, the effects of guanfacine will be examined in a larger number of patients, and there will also be a systematic assessment of whether the drug is only effective in patients with particular patterns of brain damage.

Clinical Details

Official title: A Trial of Guanfacine, an Alpha 2 Adrenergic Agonist, for Spatial Neglect and Impaired Vigilance Following Stroke and Focal Brain Damage

Study design: Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Caregiver, Investigator), Primary Purpose: Treatment

Primary outcome: Performance on tests of hemispatial neglect and sustained attention

Secondary outcome: Performance on Motor Tasks

Detailed description: The current study has a double-blind crossover design where patients will receive a single 2mg dose of oral guanfacine and a single dose of placebo. They will receive one of these on Day 2 of the study period and the other on Day 4. They will be tested daily on Days 1 to 5 so that any test repetition or long-term drug effects can be gauged. On days 2 and 4 they will be tested twice-once prior to drug/placebo administration and again 90 minutes after drug/placebo administration. Tests will include standard pen-and-paper tasks for neglect as well as computerised tests of sustained attention and visual exploration. In our published pilot study (Malhotra et al, 2006) there was a suggestion that patients without damage to frontal cortex were more likely to respond to guanfacine. In the current study we intend to test 10 patients with and 10 patients without frontal damage in order to test this further.

Eligibility

Minimum age: 18 Years. Maximum age: N/A. Gender(s): Both.

Criteria:

Inclusion Criteria:

- Age 18 or more

- Greater than 2 weeks following stroke

- Ability to give consent

- Evidence of robust Visual Neglect when tested twice with cancellation tasks.

Exclusion Criteria:

- Less than 2 weeks following stroke

- Concomitant illness that may affect interpretation of any findings

- Labile blood pressure following stroke

- Systolic BP less than 100 mmHg and / or diastolic less than 70 mmHg

- New antihypertensive medication started within last 3 weeks

- Patients with hepatic or renal dysfunction

- Patients receiving other medications known to potentiate guanfacine's

antihypertensive and hypotensive effects or cause torsade de pointes, specifically antipsychotics (including sultopride, chlorpromazine, thioridazine, amisulpiride, sulpiride, haloperidol), and moxifloxacin, baclofen, verapamil, quinidine, hydroquinidine, dispyramide, amiodarone, dofetilide, ibutilide, sotalol, pimozide, bepridil, cisapride, diphemanil, erythromycin IV, halofantrine, pentamidine, sparfloxacin, vincamine, alfuzosin, prazosin, terazosin, tamsulosin, amifostine

- Patients with diagnosis of brain tumour

- Patients with weight less than 55kg

- Patients who are pregnant

- Mothers who are breast feeding

- Patients with severe coronary insufficiency or myocardial infarction in previous 6

months

- Cognitive impairment, dysphasia or dementia that prevents patient from giving

informed consent

- Severe mental impairment or physical handicap following stroke that prevents patients

from giving consent or performing basic (standard clinical) tests for neglect

Locations and Contacts

Imperial College Healthcare NHS Trust, London W6 8RF, United Kingdom
Additional Information

Related publications:

Malhotra PA, Parton AD, Greenwood R, Husain M. Noradrenergic modulation of space exploration in visual neglect. Ann Neurol. 2006 Jan;59(1):186-90.

Starting date: April 2010
Last updated: June 3, 2015

Page last updated: August 23, 2015

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